Laminated sheet material and method of preventing slippage between the laminations



May 6, 1924, 1 1,493,447

0. A. HEPPES LAMINATED SHEET MATERIAL AND METHOD OF PREVENTING SLIPPAGEBETWEEN THE LAMINATIONS Filed June 5, 1922 Patented May 6, 1924.

UNITED STATES 1,493,447 PATENT oFFicar OTTO- AnHEPPES, or LA GRANGE,ILLINOIS, Assroivon. To THE FLINTKOTE COMPANY, or BOSTON, MASSACHUSETTS,A CORPORATION OF MASSACHUSET S.

LAMINATED SHEET MATERIAL AND METHOD OF PREVENTING SLIPPAGE THELAMINATIONS.

Application filed June 5, 1922. Serial No. 566,018.

I To all whom it may 001i 001% Be it known that I, OTTO HErPEs, a

citizen of the United States, residing at La Grange, in the county ofCook and State of Illinois, have invented new and useful Improvements inLaminated Sheet Materials and Methods of Preventing Slippage Be- I tweenthe Laminations, of which the following is a specification.

For certain purposes, such for example as builders paper, ithas been thepractice to form laminated sheet material by cement ng one or morelayers or plies of paper together face to face, using asphalt or similarV- .cous material as an adhesive. When this laminated material is piledup, as in the stock room, much difficulty has been experienced withrelative slippage of the sheets or laminations, the asphalt or othercementing material flowing slightly, the asphalt appearing as blackedges oppositely disposed on the two sides of the complete sheets.Usually these-edges must be trimmed off before the sheets are used, thuscausing expenditure of labor and time and waste of material. Anothertroublesome result of this slippage is that piles of the. material donot stand up, due to the cumulative eifectof slippage between adjacentlaminations. This necessitates constant restacking in order both toeconomize storage space and to. insure that the material is incondition-for packing and shipping as required.

'This invention provides a construction of and method of treating suchsheet material preventing or lessening this slippage so as to eliminatewaste and to increase the ease with which the material may be stored andtransported. For a more complete understanding of this invention,together with further objects and advantageous details "of construction,

reference may be had to the accompanying drawings in which- Figurel is aplan of a portion of the material treated according to one method.

Figure 2 is a fragmentary perspective sec tioned on'line 22 of Figure 1.

Figure 3 is a view similar to Figure 1 showing a modified embodiment ofthe invention.

Figure is a'fragmentary' section on line .4-4 of Figure 3. t a

as to formbetween the pairs strip 7 which is a view similar toFiguressection showing a may be indented from one face of the mate--rial out of the planes of the plies to form 10- cal interlockingsecuring elements 8 in 'the two plies. All these portions 7 may bestruck in the same direction, or, if desired, they may be struck inopposite directions .as shown for example in Figure 6. Slippage betweenthe plies is prevented in this construction by the portion 7 of the plyl engaging opposite a flat portion ofthe ply 2.

Another method of forming'the interlock ing elements on the variousplies is shown in Figures 3 and 4 in which a series of indentations '10may be made on one or both faces of the material causing matingindentations in the rema ning plies. Such. indentations may be producedby the use of a rounded plunger which may be driven against one face'ofthe material.

In Figures 5 and 6 is shown a still dif ferent method inwhich slits 15arearranged parallel with the edges of thematerial near the margins andthe partially severed strips 16 between the slits 15 and the margins arelaterally deflected similar to the portion 7 of the/form shown inFigures land 2. These views show three ,ply material;

Still another method is shown in Figure 7 in which material may bepartially punched, being cut entirelythrough on one side of the punchedportion, as shown at.

20, so as to offsetportions of'the plies relative to their mainportions, the opposite sides 21 of thepunched partsbeing. pref-- erablyuncut.

In all these constructions it is evident that local interlockingelementsare formed between the several plies which prevent relative slippagethereof otherwise possible I Q mecca? due to the viscosity of thecementing material. These interlocking elements I are formed from thematerial of the plies and may be so small and inconspicuous as to haveno deleteriouseffect on the usefulness of the material. 7 r

Having thus described certain embodt ments of this invention, itrshould'be eviwhich consists inlocally cutting the cemented material anddeflecting it adjacent the cuts.

2. Themethod of preventing slippage be-- tweena plurality of sheets ofmaterial cemented face to face with viscous material, which comprisescutting pairs of spaced slots therein and deflectiiigthe materialbetween said slots.

3. Laminated sheet material having its laminations cemented togetherwith viscous material, and cut through locally, the material adjacentsaid cuts being bent out-of the planes of the laminations to forminterengaging locking elements.

4. Laminated sheet material having its laminations cemented togetherwith viscous material, and being cut through by a series of pairs ofspaced slits, the material between said slits being deflected out of theplanes of the laminations to form interengaging v locking elements.

5. Laminated sheet material'h aving its laminations cemented togetherwith viscous material, and cut through locally-adjacent its margin, thematerial adjacent said cuts being bent out of the planes of thelaminations to form' interengaging locking elements.

' 6, Laminated sheet materiahhaving its laminations cemented togetherwith viscous material, and being cut through by a series of pairs ofspaced splits adjacent its mangin, the material between said slits beingdeflected out of the planes of thelaminations to form interengaginglocking elements,

In testimony whereof I havefaifixed my signature.

czr'rc A. Barres.

